I'm getting this too. I've pin pointed to an MP3 file. Nothing out of the ordinary here, the files have are stored locally and have been imported properly. With the audio layer deactivated the article imports into the folio just fine but turn it on and this is the error we get.

It could be either due to a forward slash on the end of any URLs specified for Web Content Overlays or due a an invalid path for Image Sequence and Panorama Overlays. If you are using Folio Producer tools 1.8 or 1.9 the error due to forward slash shouyld not be causing the problem.

Thanks for the help guys however I'm still getting the error. I'll stress that it's only .mp3 files that are causing this message to appear. The file names are sound (no slash's etc) and it seems to do it on any mp3, even ones we successfully managed to import and publish last month. We've managed to wrap them in HTML for a quick fix but I'd appreciate if this could be investigated / replicated.

@Laubender : The recommended file formats for Pan and Zoom are either JPEG or PNG. It does not work as desired with TIFF format. For best results, use JPEG images. Make sure that the image has the exact dimensions you want to use. For example, to pan a 1024-by-1024 pixel image within a 200-by-200 pixel view area, create a 1024-by-1024 image in 72 dpi.

I got this error after opening a folio I was working on in which I hadn't imported any new files. It turns out that I received the error because of a few .tif files I had placed. I went through and relinked all the .tifs with .jpgs and solved the problem.